Grant after following your recommendation? It’s the interconnect probably it’s loose .
If that’s true, then excellent news!
If you have some contact cleaner/enhancer, then now might be a good time to clean your interconnects and apply some contact enhancer. Something as basic as CAIG DeOxit, or rubbing alcohol would work. I like Stabilant22; NATO approved for avionics and other electronics applications.
BTW, if you haven’t yet gone through the troubleshooting steps, I know the process looks daunting. It’s not. Just break it down step by step.